Abstract: Disclosed are a Ni-based catalyst for an unsteady-state trace CO, methanation reaction, and a preparation method thereof. The Ni-based catalyst according to the disclosure is composed of an active metal Ni and an oxide support, wherein the oxide support is composed of a rare earth oxide (REO) and an inert oxide; and the rare earth oxide and the inert oxide exhibit an excellent synergistic effect to ensure both high reactivity and weak adsorption and desorption interference. The Ni-based catalyst has a mass percentage of the active metal Ni of 40 wt. % to 90 wt. %, and a mass percentage of the REO of 0.5 wt. % to 20 wt. %, a balance being the inert oxide. The preparation method of the disclosure is a co-precipitation method, including a direct mixing for co-precipitation, a constant-speed dropwise addition for co-precipitation, and a microchannel mixing for co-precipitation.

Abstract: Disclosed is a multi-stage plasma reactor system with hollow cathodes for cracking carbonaceous material with each stage comprising: hollow cathodes and hollow anodes cooled by recycling cooling medium or refrigerant; working gas inlet(s); inlet(s) of carbonaceous material and carrier gas as feedstock; reaction tubes in connection with the anode or cathode, in addition, the reactor system also comprises: at least one inlet(s) of quench medium located lower portion of last one of the reaction tubes; and at least one outlet(s) of quenched products and gases located on bottom or lower portion of last one of the reaction tubes, wherein chambers are formed between the first hollow cathode or the hollow cathode used as the reaction tube of any stage and the anode so as to generate plasma gas and/or electric arc therein, generated plasma gas jet fully contacts and efficiently mixes with the carbonaceous material and carrier gas as feedstock and/or volatiles caused by pyrolysis within or nearby highest temperature re

Abstract: Disclosed is a multi-stage plasma reactor system with hollow cathodes for cracking carbonaceous material with each stage comprising: hollow cathodes and hollow anodes cooled by recycling cooling medium or refrigerant; working gas inlet(s); inlet(s) of carbonaceous material and carrier gas as feedstock; reaction tubes in connection with the anode or cathode, in addition, the reactor system also comprises: at least one inlet(s) of quench medium located lower portion of last one of the reaction tubes; and at least one outlet(s) of quenched products and gases located on bottom or lower portion of last one of the reaction tubes, wherein chambers are formed between the first hollow cathode or the hollow cathode used as the reaction tube of any stage and the anode so as to generate plasma gas and/or electric arc therein, generated plasma gas jet fully contacts and efficiently mixes with the carbonaceous material and carrier gas as feedstock and/or volatiles caused by pyrolysis within or nearby highest temperature re