Formation of acidic hydroxyl groups during preparation of Pt/KL catalysts as studied by ~1H MAS NMR

机译：通过〜1H MAS NMR研究了Pt / KL催化剂制备过程中酸性羟基的形成

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Acidic hydroxyl groups in Pt/KL zeolite prepared by the ion exchange method have beenrncharacterized quantitatively by means of ~1H MAS NMR. After the ion exchange byrn[Pt(NH_3)_4]~(2+), the calcination process produces acidic hydroxyl groups. NH_4~+ ions produced byrndecomposition of [Pt(NH_3)_4]~(2+) are considered to be the origin. It is confirmed that NH_4~+ ionsrnare produced during heat treatments under vacuum. The H_2 reduction process also producesrnthe acidic hydroxyl groups as well as Pt metal clusters by the following reaction: Pt~(2+) + H_2 ?rnPt~0 + 2H~+. This indicates that after the calcination Pt~(2+) ions are the dominant species. ~1Hrnchemical shift, which is related to acidity, depends on the concentrations of Pt and the acidicrnhydroxyl groups and also on the Pt state. The stronger acidity is originated in the followingrnorder of Pt~(2+) > H~+ > K~+.

机译：通过离子交换法制备的Pt / KL沸石中的酸性羟基已通过〜1H MAS NMR进行了定量表征。通过[Pt（NH_3）_4]〜（2+）进行离子交换后，煅烧过程产生酸性羟基。由[Pt（NH_3）_4]〜（2+）分解产生的NH_4〜+离子被认为是起源。可以确认在真空下进行热处理时会产生NH_4〜+离子。 H_2还原过程还通过以下反应生成酸性羟基以及Pt金属簇：Pt〜（2+）+ H_2→rnPt〜0 + 2H〜+。这表明煅烧后Pt〜（2+）离子为主要物质。与酸度相关的〜1化学位移取决于Pt和酸性羟基的浓度以及Pt状态。较强的酸性源于Pt〜（2+）> H〜+> K〜+。

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《13th International Zeolite Conference, 13th, Jul 8-13, 2001, Montpellier, France》|2001年|p.1-8|共8页
会议地点 Montpellier(FR);Montpellier(FR)
作者
Takayuki Sato; Shin-ichi Ito; Kimio Kunimori; Shigenobu Hayashi;
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作者单位

Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan;

Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan;

Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan;

National Institute of Materials and Chemical Research, 1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan e-mail address: hayashi@nimc.go.jp;

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原文格式 PDF
正文语种 eng
中图分类 TQ649.45;
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Formation of acidic hydroxyl groups during preparation of Pt/KL catalysts as studied by ~1H MAS NMR

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