Light Promotion and Different Reaction Pathways Enhance Photothermocatalytic Syngas Production for Cellulose Steam Reforming Over Ni/θ‐Al2O3

Author:

Zhong Mengqi1,Li Yuanzhi1ORCID,Wu Jichun1,Hu Qianqian1,Hu Yaqi1,Du Qing1,Ji Cong1,Cao Huamin1,Ji Lei1

Affiliation:

1. State Key Laboratory of Silicate Materials for Architectures (Wuhan University of Technology) 122 Luoshi Road Wuhan 430070 P. R. China

Abstract

AbstractThe photothermocatalytic cellulose steam reforming strategy has provided a sustainable approach, directly converting the largest renewable carbon resource (biomass), into syngas (H2 and CO) which are clean and high‐value‐added energy carriers. However, this strategy for achieving high catalytic efficiency inevitably produces char, resulting in rapid deactivation and difficult recovery of catalysts, impeding industrial application. Herein, the Ni NPs (nanoparticles) loaded on θ‐phase Al2O3 (Ni/θ‐Al2O3) catalyst enable efficient conversion of char generated during photothermocatalytic cellulose steam reforming process, thereby exhibiting high production rates of syngas (H2 3776.3 and CO 2028.1 mmol h−1) and excellent durability (no deactivation after 4 cycles). Compared with a reference catalyst of Ni NPs loaded on amorphous SiO2 (Ni/am‐SiO2), this study finds that the elementary step of char conversion with H2O to syngas can be enhanced on Ni/θ‐Al2O3. With an emphasis on the mechanism, a different pathway is discovered that surface hydroxyl groups participating in the formation of HCO* intermediates, further dissociating to syngas, significantly facilitate the conversion of char. Additionally, on Ni/θ‐Al2O3, the photoactivation effect enhances catalytic activity, particularly promoting the conversion of H2O with char to syngas, thus preventing deactivation caused by encapsulation of char.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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