The promoting effect of La2O3 on Ni/γ-Al2O3 methanation catalyst was investigated by XPS, TPR and TPD methods. Results indicated that La2O3 can be partially reduced to LaOx (x＜3/2) during H2 reduction of the Ni cata...The promoting effect of La2O3 on Ni/γ-Al2O3 methanation catalyst was investigated by XPS, TPR and TPD methods. Results indicated that La2O3 can be partially reduced to LaOx (x＜3/2) during H2 reduction of the Ni catalysts with La2O3.The excess charge associated with the LaOx can be transfered to Ni. It weakened C-O bond strength, accelerated CO dissociation, proportionation and methanation reaction.The interaction between NiO and Al2O3 can be suppressed and the formation of NiAl2O4-like species can be reduced by adding La2O3. With the increase of La2O3 con tents the fraction of NiO which is easier to be reduced becomes larger.The fact that there was more residual H2 on the catalyst with La2O3 means that it is able to retain some H2. Besides, the distribution of CO adsorption sites of the Ni catalyst was shifted by adding La2O3.展开更多
研究了白庙子斜发沸石在水热离子交换中阳离子交换容量、配位阳离子交换度及K+、N a+、C a2+离子在该矿样上的交换量.实验发现,该矿铵离子交换容量为1.73 mm o l/g,配位阳离子交换度C a2+>K+>M g2+>N a+.在铵改性矿样NH4Z上K+...研究了白庙子斜发沸石在水热离子交换中阳离子交换容量、配位阳离子交换度及K+、N a+、C a2+离子在该矿样上的交换量.实验发现,该矿铵离子交换容量为1.73 mm o l/g,配位阳离子交换度C a2+>K+>M g2+>N a+.在铵改性矿样NH4Z上K+离子属超容量交换,交换量达78.2 m g/g,对海水提钾有应用价值.在不同离子交换矿样上C a2+交换量NH4Z>N aZ>KZ>O rZ,在钠改性矿样N aZ上C a2+离子交换量可达32.4 m g/g,对硬水软化有应用价值.展开更多
文摘The promoting effect of La2O3 on Ni/γ-Al2O3 methanation catalyst was investigated by XPS, TPR and TPD methods. Results indicated that La2O3 can be partially reduced to LaOx (x＜3/2) during H2 reduction of the Ni catalysts with La2O3.The excess charge associated with the LaOx can be transfered to Ni. It weakened C-O bond strength, accelerated CO dissociation, proportionation and methanation reaction.The interaction between NiO and Al2O3 can be suppressed and the formation of NiAl2O4-like species can be reduced by adding La2O3. With the increase of La2O3 con tents the fraction of NiO which is easier to be reduced becomes larger.The fact that there was more residual H2 on the catalyst with La2O3 means that it is able to retain some H2. Besides, the distribution of CO adsorption sites of the Ni catalyst was shifted by adding La2O3.
文摘研究了白庙子斜发沸石在水热离子交换中阳离子交换容量、配位阳离子交换度及K+、N a+、C a2+离子在该矿样上的交换量.实验发现,该矿铵离子交换容量为1.73 mm o l/g,配位阳离子交换度C a2+>K+>M g2+>N a+.在铵改性矿样NH4Z上K+离子属超容量交换,交换量达78.2 m g/g,对海水提钾有应用价值.在不同离子交换矿样上C a2+交换量NH4Z>N aZ>KZ>O rZ,在钠改性矿样N aZ上C a2+离子交换量可达32.4 m g/g,对硬水软化有应用价值.
