Hydrogen Production By Low-temperature Reforming Of Bio-oil Over A CNT-promoting Ni Catalyst

Biomass is rich and friendly environmentally renewable resource, hydrogen production from biomass is one of the most promising options and it is in the development process. Enhancing hydrogen yield and energy efficiency, decreasing hydrogen production cost and the deactivation of the catalyst, etc., these key problems are needed to settle. Recently, Carbon nanotube (CNT) performs superior characters and advantages compared with other traditional catalytic materials. And it has been paid a great attention by academe and industry because of its potentials applied in different areas such as fine chemicals synthesis, petrochemicals, fuel cells and so on.In present work, we prepared a novel CNT supported Ni catalyst, and investigated the influences of the preparation factors. We also studied the reacting rules when the Ni-CNTs catalyst applied in the processes of common steam reforming and electric catalytic reforming.1. Preparation and screening of Carbon nanotube supported Ni catalyst A high catalytic activity of CNTs-supported Ni catalyst (x%Ni-CNTs) was synthesized by the homogeneous deposition-precipitation method, which was successfully applied for low-temperature reforming of organic compounds in bio-oil. The preparing method was investigated and optimized, and the relationship between the carbon conversion, hydrogen yield and the Ni content was also discussed.2. Study on the common steam reforming and electric catalytic reforming of bio-oil to produce hydrogen using 15%Ni-CNTs as catalyst The common steam reforming and electric catalytic reforming of bio-oil to produce hydrogen using 15%Ni-CNTs as catalyst was investigated. We also studied the effects of the reforming experiments, including temperatures, current, S/C, etc., on the carbon conversion, hydrogen yield and products distribution.3. The influences of different catalyst preparation methods on steam reforming of bio-oilEthylene glycol-Na2CO3 deposition method, urea hydrolyzing homogeneous deposition-precipitation method and ammonia deposition method was utilized to prepare 15%Ni-CNTs catalyst. And their catalytic activities on steam reforming of bio-oil were studied, too. It is found that the averaged Ni crystallite size decreased according to the following order: ammonia deposition method > urea hydrolyzing homogeneous deposition-precipitation method > Ethylene glycol-Na2CO3 deposition method. And it is also found that the smaller Ni crystallite size led to higher carbon conversion and hydrogen yield. Moreover, the addition of PVP in the preparation process of Ethylene glycol-Na2CO3 deposition resulted in a much smaller Ni crystallite size, and promoted the catalytic activities.