JP6807661B2 - ガス吸着材、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、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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- JP6807661B2 JP6807661B2 JP2016110262A JP2016110262A JP6807661B2 JP 6807661 B2 JP6807661 B2 JP 6807661B2 JP 2016110262 A JP2016110262 A JP 2016110262A JP 2016110262 A JP2016110262 A JP 2016110262A JP 6807661 B2 JP6807661 B2 JP 6807661B2
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- gas
- gas adsorbent
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- adsorbent
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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 (11)
- 水分吸着能を有し、酸化カルシウムを90質量%以上含む粒子と、
前記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、Ba−Li合金を90質量%以上含む金属の層と
を備えるガス吸着材であって、
前記金属の層の平均厚さは、1.3μm以上6.6μm以下であり、
前記粒子と前記金属の層の総質量を基準にして前記金属の含有量は、2質量%以上10質量%以下である
ことを特徴とするガス吸着材。 - 請求項1に記載のガス吸着材を製造する方法であって、
不活性ガス雰囲気中で、
酸化カルシウムを90質量%以上含む粒子をBa−Li合金を90質量%以上含む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粒子に、固体状態の前記金属を添加し混合物を形成する添加工程と、
前記添加工程での前記混合物内の前記金属を溶融させながら粒子と前記金属との混合物が均一になるまで混合して前記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の製造方法。 - 前記混合物を混合する混合工程で、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未満となるように、前記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2に記載のガス吸着材の製造方法。 - 請求項1に記載のガス吸着材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4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5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4〜6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4〜7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4〜8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4〜9のいずれか1項に記載のガス吸着体。 - 請求項4〜10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、及び選択的に前記被覆層用ガス吸着材を含む被覆層用材料で覆う被覆工程と、
前記被覆層用材料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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