催化学报
催化學報
최화학보
CHINESE JOURNAL OF CATALYSIS
2014年
12期
1927-1936
,共10页
孙亚会%曲振平%陈丹%王辉%张帆%傅强
孫亞會%麯振平%陳丹%王輝%張帆%傅彊
손아회%곡진평%진단%왕휘%장범%부강
羟基磷灰石改性%柠檬酸钠%比表面积%羟基%甲醛催化氧化
羥基燐灰石改性%檸檬痠鈉%比錶麵積%羥基%甲醛催化氧化
간기린회석개성%저몽산납%비표면적%간기%갑철최화양화
Modified hydroxyapatite%Sodium citrate%Specific surface area%Hydroxyl group%Formaldehyde catalytic oxidation
分别采用十六烷基三甲基溴化铵(CTAB)、十二烷基硫酸钠(SDS)及柠檬酸钠(SC)对羟基磷灰石(HAP)进行了有机改性。柠檬酸钠改性的羟基磷灰石对甲醛催化氧化表现出最好的催化活性,在240°C实现了甲醛完全转化。通过X射线衍射、红外光谱、N2吸附-脱附、扫描电镜和热重/差重等手段对HAP结构进行了表征。结果表明, SC改性使得HAP比表面积和孔体积增加,孔径减小,更有利于吸附及传质,从而提高了其活性。此外, SC改性的HAP中羟基含量更多,更有利于甲醛与羟基之间发生相互作用,这是该样品活性提高的另一个原因。
分彆採用十六烷基三甲基溴化銨(CTAB)、十二烷基硫痠鈉(SDS)及檸檬痠鈉(SC)對羥基燐灰石(HAP)進行瞭有機改性。檸檬痠鈉改性的羥基燐灰石對甲醛催化氧化錶現齣最好的催化活性,在240°C實現瞭甲醛完全轉化。通過X射線衍射、紅外光譜、N2吸附-脫附、掃描電鏡和熱重/差重等手段對HAP結構進行瞭錶徵。結果錶明, SC改性使得HAP比錶麵積和孔體積增加,孔徑減小,更有利于吸附及傳質,從而提高瞭其活性。此外, SC改性的HAP中羥基含量更多,更有利于甲醛與羥基之間髮生相互作用,這是該樣品活性提高的另一箇原因。
분별채용십륙완기삼갑기추화안(CTAB)、십이완기류산납(SDS)급저몽산납(SC)대간기린회석(HAP)진행료유궤개성。저몽산납개성적간기린회석대갑철최화양화표현출최호적최화활성,재240°C실현료갑철완전전화。통과X사선연사、홍외광보、N2흡부-탈부、소묘전경화열중/차중등수단대HAP결구진행료표정。결과표명, SC개성사득HAP비표면적화공체적증가,공경감소,경유리우흡부급전질,종이제고료기활성。차외, SC개성적HAP중간기함량경다,경유리우갑철여간기지간발생상호작용,저시해양품활성제고적령일개원인。
Hydroxyapatite (HAP) was modified by adding various organic molecules, such as cetyltrime‐thylammonium bromide, sodium dodecyl sulfate, and sodium citrate, during the precipitation of HAP. Sodium citrate‐modified HAP displayed the best activity for formaldehyde oxidation, achieving complete conversion at 240 °C. The influence of the organic modifiers on the structure of HAP was assessed by X‐ray diffraction, Fourier transform infrared spectroscopy, N2 adsorption‐desorption, scanning electron microscopy, and thermogravimetry/derivative thermogravimetry. The higher specific surface area and pore volume, and smaller pores, owing to modification with sodium citrate, favored adsorption, mass transfer, and interaction process during formaldehyde oxidation. Fur‐thermore, the higher hydroxyl group content observed in sodium citrate‐modified HAP enhanced interactions between formaldehyde and HAP, thus resulting in higher catalytic activity.