JP2017213535A - ガス吸着材粒子、その製造方法、これを用いたガス吸着体及びその製造方法 - Google Patents
ガス吸着材粒子、その製造方法、これを用いたガス吸着体及びその製造方法 Download PDFInfo
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Abstract
Description
Ba + 2H2O → Ba(OH)2 + H2 (147cc/g)・・・(2)
前記式(1),(2)によれば、例えば、バルク状又は粒子上の合金を圧縮成形して塊となし、これを水分と反応させたとすると、Ba−Li合金のグラム当たり442ccの水素ガスが発生する。
図3に、吸着性組成物10の製造工程を示す。なお、以下の製造工程は、吸着性組成物10の劣化・発火を抑制する観点から、全て不活性ガス雰囲気中で行う。不活性ガスは、例えば純度99.99%以上のアルゴンガス等である。
図4に示すように、上述のごとく得られた吸着性組成物10を用いてガス吸着体7を製造する。なお、本工程も、吸着性組成物10及びガス吸着体7の劣化・発火を抑制する観点から、全て不活性ガス雰囲気中で行う。不活性ガスは、例えば純度99.99%以上のアルゴンガスである。
Ar雰囲気下、酸化カルシウムCaO(平均粒径200μm、吉澤石灰工業製)2.45gを坩堝に入れ500℃のホットプレート上で15分加熱する。その後、加熱した酸化カルシウム中に、BaLi4(平均粒径300μm以下、純度99%以上、高純度化学製)0.05gを添加し、BaLi4を溶融させながら酸化カルシウムと均一になるまで混合した。室温まで冷却し酸化カルシウム表面にBaLi4が付着した粒子状の吸着性組成物を得た。
Tbcb={[(Vb/Nbc)+Vbcc]×[3/(4×3.14)]}1/3−rbcc・・・(1)
但し、以下の表2に示すように、VbはBaLi4の体積、NbcはBaLi4/CaO粒子の個数、VbccはBaLi4/CaO粒子1個当たりのCaO粒子部分の体積、及びrbccはBaLi4/CaO粒子におけるCaO粒子部分の半径(仮定)である。
実施例2〜4はBaLi4の濃度を3〜10wt%まで変化させた以外は実施例1と同様の方法により調製及び測定を行った。
実施例5は、実施例3で作製したBaLi4/CaO粒子の圧粉体を用いてガス吸着体を作製したものである。すなわち、Ar雰囲気下、実施例3で作製したBaLi4/CaO粒子0.5gを直径10mmφの円筒状のダイとパンチを用いて40kNの圧力でプレスし圧粉体を得た。次に、直径20mmφの円筒状のダイとパンチ用いてまず1gの酸化カルシウムを入れ、その上に圧粉体を置き、さらに上から1gの酸化カルシウムを入れ40kNの圧力でプレスしガス吸着体を得た。そして実施例1と同様の方法により測定を行った。
比較例1は、市販のBaLi4吸着材を前記同様の手法で評価したものである。
比較例2,3は、BaLi4を予めホットプレート上の坩堝中で500℃に加熱しておき、別途500℃に加熱しておいたCaOをBaLi4中に加えた以外は、各々実施例3,4と同様の方法により調整及び測定を行った。
実施例1〜5の窒素吸着量は、比較例1のそれに比べて十分高い値を示し、水素発生量は比較例1のそれに比べて十分低い値を示すことが判る。
10 吸着性組成物(ガス吸着材粒子)
10’ ガス吸着材層
11 被覆材
11’ 被覆層
15 添加材粒子
16 ガス吸着性金属
17 水分吸着材
18 被覆層用ガス吸着材
Claims (15)
- 水分吸着能を有する添加材粒子と、
前記添加材粒子の表面に形成され、ターゲットガスの吸着能を有するとともに水分によって不活性化される金属の層と
を備え、
前記金属の層の平均厚さは、37μm以下である
ことを特徴とするガス吸着材粒子。 - 前記添加材粒子の90質量%以上は、酸化カルシウムであり、
前記金属の90質量%以上は、Ba−Li合金である
ことを特徴とする請求項1に記載のガス吸着材粒子。 - 前記添加材粒子と前記金属との総量に対する前記金属の含有量は、45質量%以下である
ことを特徴とする請求項1又は2に記載のガス吸着材粒子。 - 前記金属の層の平均厚さは、0.65μm以上37μm以下である
ことを特徴とする請求項1〜3のいずれか1項に記載のガス吸着材粒子。 - 前記金属の層の平均厚さは、1.3μm以上6.6μm以下である
ことを特徴とする請求項1〜4のいずれか1項に記載のガス吸着材粒子。 - 請求項1〜5のいずれか1項に記載のガス吸着材粒子を製造する方法であって、
不活性ガス雰囲気中で、
前記添加材粒子を前記金属の融点以上の温度に加熱する加熱工程と、
前記加熱工程で加熱された前記添加材粒子に、前記金属を添加する添加工程と、
前記添加工程で金属が添加された前記添加材粒子を混合して前記添加材粒子の表面を前記金属で覆う混合工程と、
前記混合工程で得られた混合物を冷却する冷却工程と
を備えたことを特徴とするガス吸着材粒子の製造方法。 - 前記混合工程で、水と反応させたときに発生する可燃性ガスの発生量が前記金属のグラム当たり200cc/g未満となるように、前記添加材粒子に対して前記金属が配合される
ことを特徴とする請求項6に記載のガス吸着材粒子の製造方法。 - 請求項1〜5のいずれか1項に記載のガス吸着材粒子を含有するガス吸着材層と、
前記ガス吸着材層の表面に形成され、水分吸着材を含有する被覆層とを備えた
ことを特徴とするガス吸着体。 - 前記被覆層は、さらに酸素及び水素を吸着可能な被覆層用ガス吸着材を含む
ことを特徴とする請求項8に記載のガス吸着体。 - 前記水分吸着材は、酸化カルシウムであり、
前記被覆層用ガス吸着材は、酸化チタン及び酸化パラジウムである
ことを特徴とする請求項9に記載のガス吸着体。 - ペレット形状を有する
ことを特徴とする請求項8〜10のいずれか1項に記載のガス吸着体。 - 前記被覆層の最大厚さは、1mm以上60mm以下である
ことを特徴とする請求項8〜11のいずれか1項に記載のガス吸着体。 - 前記被覆層の最大厚さは、2mm以上40mm以下である
ことを特徴とする請求項8〜12のいずれか1項に記載のガス吸着体。 - 前記被覆層の最大厚さは、5mm以上20mm以下である
ことを特徴とする請求項8〜13のいずれか1項に記載のガス吸着体。 - 請求項8〜14のいずれか1項に記載のガス吸着体を製造する方法であって、
不活性ガス雰囲気中で、
前記ガス吸着材粒子を、圧粉して前記ガス吸着材層を得る圧粉工程と、
前記ガス吸着材層の表面を前記水分吸着材を含む被覆材で覆う被覆工程と、
前記被覆材で覆われた前記ガス吸着材層をさらに加圧して前記被覆層を形成する成形工程とを備えた
ことを特徴とするガス吸着体の製造方法。
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