Two microporous carbon molecular sieve(CMS)samples with different surface properties were obtained from a commercial CMS through deashing treatment(C1)and then oxidation(C2)by 30%H2O2 solution.Both the two samples wer...Two microporous carbon molecular sieve(CMS)samples with different surface properties were obtained from a commercial CMS through deashing treatment(C1)and then oxidation(C2)by 30%H2O2 solution.Both the two samples were characterized by acidic/basic titration,N2 adsorption isothermal(BET),point of zero charge(pHPZC).Decomposition of H2O2 in dilute unbuffered solution was carried and the evolved oxygen was measured volumetrically.After oxidation,the surface acidity and total surface oxygen-containing groups increased,while the special surface area and total pore volume slightly decreased.The experimental results showed that the H2O2 decomposition reaction on CMS obeyed the first-order kinetic.The activation energy(Ea)of the decomposition reaction on oxidized CMS increase from 33.3(C1)to 45.5(C2)kJ.mol-1,however the negative value of activation entropy of the reaction(ΔS≠)decreased from-197(C1)to-159(C2)J.mol-1.K-1 calculated by transition state theory.展开更多
采用柠檬酸络合法制备了La BO3(B=Fe,Co,Ni)钙钛矿催化剂,通过X-射线粉末衍射(XRD)、傅立叶-红外光谱(FT-IR)、透射电镜(TEM)、X-射线光电子能谱(XPS)等对催化剂进行了表征,在室温下测定了其对H2O2的催化分解能力.结果表明:催化分解能...采用柠檬酸络合法制备了La BO3(B=Fe,Co,Ni)钙钛矿催化剂,通过X-射线粉末衍射(XRD)、傅立叶-红外光谱(FT-IR)、透射电镜(TEM)、X-射线光电子能谱(XPS)等对催化剂进行了表征,在室温下测定了其对H2O2的催化分解能力.结果表明:催化分解能力依次为La Ni O3>La Co O3>La Fe O3,说明Ni较Co和Fe能更好地分解H2O2.通过改变La Fe O3催化剂的形貌也能提高催化剂性能,如多孔状La Fe O3较负载在SBA-15上的La Fe O3具有更好的催化分解活性.展开更多
文摘Two microporous carbon molecular sieve(CMS)samples with different surface properties were obtained from a commercial CMS through deashing treatment(C1)and then oxidation(C2)by 30%H2O2 solution.Both the two samples were characterized by acidic/basic titration,N2 adsorption isothermal(BET),point of zero charge(pHPZC).Decomposition of H2O2 in dilute unbuffered solution was carried and the evolved oxygen was measured volumetrically.After oxidation,the surface acidity and total surface oxygen-containing groups increased,while the special surface area and total pore volume slightly decreased.The experimental results showed that the H2O2 decomposition reaction on CMS obeyed the first-order kinetic.The activation energy(Ea)of the decomposition reaction on oxidized CMS increase from 33.3(C1)to 45.5(C2)kJ.mol-1,however the negative value of activation entropy of the reaction(ΔS≠)decreased from-197(C1)to-159(C2)J.mol-1.K-1 calculated by transition state theory.
文摘采用柠檬酸络合法制备了La BO3(B=Fe,Co,Ni)钙钛矿催化剂,通过X-射线粉末衍射(XRD)、傅立叶-红外光谱(FT-IR)、透射电镜(TEM)、X-射线光电子能谱(XPS)等对催化剂进行了表征,在室温下测定了其对H2O2的催化分解能力.结果表明:催化分解能力依次为La Ni O3>La Co O3>La Fe O3,说明Ni较Co和Fe能更好地分解H2O2.通过改变La Fe O3催化剂的形貌也能提高催化剂性能,如多孔状La Fe O3较负载在SBA-15上的La Fe O3具有更好的催化分解活性.
