Jun Zhang

Nanjing Forestry University

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Fei Wang

Technical University of Moldova

Xun Li

Nanjing Forestry University

Yu Zhang

Chinese Academy of Sciences

Zhen Wu

Huaiyin Normal University

Xiaoling Liu

Nanjing Forestry University

Yafei Wu

Shandong First Medical University

Xinxu Zhao

Nanjing Forestry University

Haian Xia

Nanjing Forestry University

Xiaopei Yan

Nanjing Forestry University

Yong Li

Institute of Mountain Hazards and Environment

Cooperative Institutions

Nanjing Forestry University

Chinese Academy of Sciences

Institute of Chemical Industry of Forest Products

Institute of Mountain Hazards and Environment

University of Chinese Academy of Sciences

Shanghai Jiao Tong University

Huaiyin Normal University

Shanghai Advanced Research Institute

Southeast University

China National Petroleum Corporation (China)

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Catalytic conversion of biomass derivative γ-valerolactone to aromatics over Zn/ZSM-5 catalyst

Journal of Fuel Chemistry and Technology (2015)

Haian Xia Jun Zhang Xiaopei Yan Siquan Xu Li Yang

ZSM-5

10.1016/s1872-5813(15)30016-5

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Citations (13)

Attapulgite‐supported magnetic dual acid–base catalyst for the catalytic conversion of lignin to phenolic monomers

Journal of Chemical Technology & Biotechnology (2018)

Zhen Wu Jun Zhang Xinxu Zhao Xun Li Yu Zhang

Abstract BACKGROUND Research on the catalytic conversion of lignin into value‐added chemicals has grown rapidly on account of the importance of lignin in the biorefinery. There is thus a need to investigate novel technologies to depolymerize lignin in the absence of hydrogen gas and noble metal catalysts. This study developed a cheap and recyclable catalyst via a facile process involving impregnation and calcination for the conversion of lignin to value‐added phenolic monomers. RESULTS Acid sites, basic sites and magnetic components were successfully incorporated into attapulgite. The resulting catalyst displayed high catalytic activity for lignin conversion to phenolic monomers, which resulted in 10.9% total monomers yield at 250 °C for 3 h with a catalyst loading of 50% and a solvent–solid ratio of 20:1 in 50% C 2 H 5 OH. The total monomers yield decreased observably after eight successive reaction runs. After being calcined at 600 °C for 3 h, the recovered catalyst provided a total monomers yield of 6.74% in the ninth reaction run. CONCLUSION A novel catalyst was successfully prepared by incorporation of acid sites, basic sites and magnetic properties using natural attapulgite clay as a precursor via a simple and inexpensive process. The resulting catalyst could depolymerize lignin efficaciously. The reusability of the catalyst was barely satisfactory, however, the activity could be partly recovered by simple calcination. © 2018 Society of Chemical Industry

10.1002/jctb.5881

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Citations (9)

Development and Application of the Environmental Safety Monitoring and Emergency Response System for Chemical Industry Hazard

Environmental Monitoring and Forewarning (2010)

Jun Zhang

Based on the analysis of the danger from the environmental pollution of the chemical industry hazard,it is necessary to set up a environmental safety monitoring and emergency response system with support of the industry wireless sensor network technique,video monitoring and automation control technique,wireless communication,geographical information system(GIS),the database and network engineering,ect.Reviewed the demand and organization of the system,introduced in detail the key technologies and application of the system,and discussed the adoptation of the system to the environmental monitoring and emergency management of the hazard of a chemical industry company.

Environmental Monitoring

Environmental Pollution

Safety Monitoring

Chemical industry

System safety

Source

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Catalytic alcoholysis of alkaline extracted lignin for the production of aromatic esters over SO₄²⁻/ZrO₂-ATP

RSC Advances (2018)

Zhen Wu Jun Zhang Qingqing Pan Xun Li Yu Zhang

An efficient process for the depolymerization of alkaline extracted lignin (AEL) using attapulgite (ATP)-supported solid catalysts in ethanol was developed in this work. Different ATP-supported catalysts were prepared and used to catalyze the depolymerization of the lignin AEL. The results demonstrated that the addition of ATP-supported catalysts was favorable for controlling the distribution of valuable depolymerization products. The optimal solid catalyst SO42-/ZrO2-ATP (Cat 2) exhibited high catalytic activity and selectivity, which showed a 78.6% conversion of AEL and a 29.4% selectivity to ethyl ferulate (ethyl 4-hydroxy-3-methoxycinnamate) with a catalyst/AEL ratio of 1 : 1 at 200 °C for 120 min. The catalyst could be reused and its catalytic activity did not obviously decreased after 6 successive runs. Particularly, a plausible mechanism involving esterification, hydrogenation, and dehydration for the production of aromatic esters from AEL depolymerization over SO42-/ZrO2-ATP in ethanol was also proposed.

Depolymerization

10.1039/c8ra00815a

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Citations (10)

Numerical Study of Wave-Induced Dynamic Soil Response and Liquefaction

Deleted Journal (2014)

Jun Zhang Xiang‐Lian Zhou Yu-guang Yan Junjie Guo Jianhua Wang

Soil liquefaction

10.16183/j.cnki.jsjtu.2014.11.018

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Citations (2)

Spatiotemporal characteristics of discontinuous soil failures on debris flow source slopes

Engineering Geology (2021)

Xiaojun Guo Yong Li Peng Cui Yan Yan Baoliang Wang

Debris flow

Intermittency

Slope failure

Catastrophic failure

Intensity

10.1016/j.enggeo.2021.106438

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Citations (10)

Co-pyrolysis of waste newspaper with high-density polyethylene: Synergistic effect and oil characterization

Energy Conversion and Management (2016)

Weimin Chen Shukai Shi Jun Zhang Minzhi Chen Xiaoyan Zhou

High-density polyethylene

Thermogravimetric analysis

Pyrolysis oil

Aqueous two-phase system

10.1016/j.enconman.2016.01.005

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Citations (212)

THE PROBLEMS IN GEOLOGICAL HAZARD RISK ASSESSMENT AND COUNTERMEASURE

Jun Zhang

Geological hazard risk assessment was a very important job for engineering construction and plan, and became a essential part of engineering construction. The problems in geological hazard risk assessment was analyzed , and several countermeasures were put forward.

Countermeasure

Geologic hazards

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Catalytic Cracking of Inedible Oils for the Production of Drop-In Biofuels over a SO₄^2–/TiO₂-ZrO₂ Catalyst

Energy & Fuels (2020)

Jun Zhang Zhen Wu Xun Li Yu Zhang Zhenghong Bao

Triglycerides from animal fats and vegetable oils are used as the sustainable feedstocks for the generation of biofuels. Tung oil, rubber seed oil, Jatropha curcas oil, waste cooking oil, and waste acidified oil were selected as the triglyceride feedstocks for the production of drop-in biofuels by a catalytic cracking process. The one-step process was carried out in a laboratory-scale fixed-bed reactor using a SO42–/TiO2-ZrO2 catalyst. The catalyst exhibited an excellent performance of cracking, deoxygenation, and aromatization reactions. Moreover, it could be repeatedly used for more than 15 times without an obvious deactivation. The catalytic cracking process resulted in a high yield (65–72%) of the biofuel, which showed a low acid value (3.78 mg KOH/g) and low oxygen content (1.49%). The biofuels were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, elemental analysis, proton nuclear magnetic resonance, and gas chromatography–mass spectrometry, suggesting that the dominant components of the biofuels are hydrocarbons in the range of C6–C26, including 17% alkanes, 56% olefins, and 22% monocyclic aromatics. These bio-hydrocarbon fuels in the crude form are chemically identical or near-identical to petroleum-based fuels, which have an attractive fraction distribution (>32% bio-gasoline, >50% green diesel, and <11% heavy fraction) and can be fractionated and used in different formulations depending on the types of desired fuels.

Fluid catalytic cracking

Fraction (chemistry)

Light crude oil

Naphtha

10.1021/acs.energyfuels.0c02204

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Citations (19)

Study on the Risk Analysis and Emergency Measures to the PX Projects of Dalian Dagushan which Impact on the Marine Environment

Applied Mechanics and Materials (2014)

Jun Zhang Jian Lin Han Zhang

By investigating and analyzing PX demand in recent years and the distribution of PX projects in Dagushan chemical industrial park, combining its physical and chemical properties and marine environment near Dalian Dagushan, aim to make environmental assessments on the damage caused by PX to the marine environment and propose appropriate emergency measures.

Industrial park

10.4028/www.scientific.net/amm.675-677.325

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Citations (2)