催化学报
催化學報
최화학보
CHINESE JOURNAL OF CATALYSIS
2010年
2期
171-175
,共5页
原位漫反射红外光谱%甲醛氧化%铂%二氧化钛
原位漫反射紅外光譜%甲醛氧化%鉑%二氧化鈦
원위만반사홍외광보%갑철양화%박%이양화태
in-situ diffuse reflectance infrared Fourier transform spectroscopy%formaldehyde oxidation%platinum%titanium dioxide
采用原位漫反射红外光谱研究了温和条件下1%Pt/TiO_2催化剂上甲醛的吸附和氧化反应,并对催化剂的失活进行了分析.结果表明,Pt/TiO_2催化剂在室温条件下即可将甲醛氧化成H_2O和CO_2,100℃以下甲酸根的分解为决速步骤,低温下催化剂失活是由于表面未能及时分解的甲酸根占据了催化剂的活性位,升温至100℃即可将甲酸根完全分解并恢复催化剂的活性.
採用原位漫反射紅外光譜研究瞭溫和條件下1%Pt/TiO_2催化劑上甲醛的吸附和氧化反應,併對催化劑的失活進行瞭分析.結果錶明,Pt/TiO_2催化劑在室溫條件下即可將甲醛氧化成H_2O和CO_2,100℃以下甲痠根的分解為決速步驟,低溫下催化劑失活是由于錶麵未能及時分解的甲痠根佔據瞭催化劑的活性位,升溫至100℃即可將甲痠根完全分解併恢複催化劑的活性.
채용원위만반사홍외광보연구료온화조건하1%Pt/TiO_2최화제상갑철적흡부화양화반응,병대최화제적실활진행료분석.결과표명,Pt/TiO_2최화제재실온조건하즉가장갑철양화성H_2O화CO_2,100℃이하갑산근적분해위결속보취,저온하최화제실활시유우표면미능급시분해적갑산근점거료최화제적활성위,승온지100℃즉가장갑산근완전분해병회복최화제적활성.
The adsorption and oxidation of formaldehyde over 1%Pt/TiO_2 under ambient conditions were investigated by in-situ diffuse re-flectance infrared Fourier transform spectroscopy (DRIFTS), and the deactivation of the catalyst was analyzed. It was found that formalde-hyde could be oxidized to H_2O and CO_2 over Pt/TiO_2 at ambient temperature, and the decomposition of formate was the key step below 100 ℃. The catalyst deactivation at low temperature was attributed to the overcast of active sites by the formate that was failed to be decomposed in time. Nevertheless, the formate on Pt/TiO_2 could be decomposed completely by increasing the reaction temperature to 100℃, and the catalyst activity could be recovered simultaneously.
