Mg-Vacancies Induced Ni-Vacancy Clusters: Highly Efficient Hydrogen Production from Cellulose
2020
H2 production from aqueous phase reforming (APR) is of great importance but desires much more enhancement of H2 production efficiency. Our previous work reported a catalytic H2 production over metal oxide (MMO) supported Ni derived from Ni-containing layered double hydroxides (Ni-MgAl-LDHs). Here we report a catalytic H2 production from APR of cellulose over MMO supported defects-rich Ni derived from Ni-MgAl-LDHs with abundant Mg (II) vacancies (VMg). The VMg well retained in the calcination under H2 atmosphere induces the formation of Ni vacancies not only at Ni-MMO interface but also on the surface of Ni particles. A H2 yield of up to 70.4 % has been achieved from APR of cellulose over the defects-rich Ni-MMO, which is almost 2.5 times of the H2 yield from APR of cellulose reported till now (~ 30 %). A combined investigation by quasi in situ XPS, EPR, PAS, and in situ FT-IR verifies that Mg vacancies on the support surface facilitate the cleavage of C-H bond, while Ni vacancies on the Ni particles boost the breakage of C-C bond.
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